Filtration apparatus



FIG. 1 is a front elevational view of the filtration apparatus according to the invention, here of the portable type;

FIG. 2 is a side elevational view of the filtration apparatus, the opposite side view being a mirror image thereof;

FIG. 3 is a back elevational view of the filtration apparatus; and,

FIG. 4 is a top view of the filtration apparatus. 

CLAIM The ornamental design for a filtration apparatus, as shown and described. 